<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2015, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://codeigniter.com
* @since Version 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');

/**
* CodeIgniter Security Helpers
*
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/helpers/security_helper.html
*/

// ------------------------------------------------------------------------

if ( ! function_exists('xss_clean'))
{
/**
* XSS Filtering
*
* @param string
* @param bool whether or not the content is an image file
* @return string
*/
function xss_clean($str, $is_image = FALSE)
{
return get_instance()->security->xss_clean($str, $is_image);
}
}

// ------------------------------------------------------------------------

if ( ! function_exists('sanitize_filename'))
{
/**
* Sanitize Filename
*
* @param string
* @return string
*/
function sanitize_filename($filename)
{
return get_instance()->security->sanitize_filename($filename);
}
}

// --------------------------------------------------------------------

if ( ! function_exists('do_hash'))
{
/**
* Hash encode a string
*
* @todo Remove in version 3.1+.
* @deprecated 3.0.0 Use PHP's native hash() instead.
* @param string $str
* @param string $type = 'sha1'
* @return string
*/
function do_hash($str, $type = 'sha1')
{
if ( ! in_array(strtolower($type), hash_algos()))
{
$type = 'md5';
}

return hash($type, $str);
}
}

// ------------------------------------------------------------------------

if ( ! function_exists('strip_image_tags'))
{
/**
* Strip Image Tags
*
* @param string
* @return string
*/
function strip_image_tags($str)
{
return get_instance()->security->strip_image_tags($str);
}
}

// ------------------------------------------------------------------------

if ( ! function_exists('encode_php_tags'))
{
/**
* Convert PHP tags to entities
*
* @param string
* @return string
*/
function encode_php_tags($str)
{
return str_replace(array('<?', '?>'), array('&lt;?', '?&gt;'), $str);
}
}